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General Forums => The Mess Hall => Topic started by: cab on August 10, 2009, 12:18:54 PM

Title: heat from defrost area
Post by: cab on August 10, 2009, 12:18:54 PM

 i have a issue with heat that seems to be coming from in between my defrost and the windshield.  could i put a manual cutoff in the heater core to stop this?  this is on a 89 wrangler.  thanks.

Title: Re: heat from defrost area
Post by: jfrabat on August 14, 2009, 04:56:16 PM

Quote from: cab on August 10, 2009, 12:18:54 PM

i have a issue with heat that seems to be coming from in between my defrost and the windshield.  could i put a manual cutoff in the heater core to stop this?  this is on a 89 wrangler.  thanks.

If it happens on the highway when going up a hill or overpass, it could be that you are running out of vacuum (because the Jeep is at WOT).  What I did was simply buy a $15 vacuum reservoir and stick it under the hood to supply the HVAC system, and I have never had the problem again.

In my case, I kind of overdid it, as I have a reservoir for the HVAC, 2 more for the Cruise Control (which is still acting up, but I think it is more of an electronic issue than a vacuum issue), and one for the brake booster (this is a big one).  Only problem I still have is that the cruise control looses power after a while and I have to disengage it.  I am still hunting for a vacuum leak, which I am sure I have, but I have been unable to locate (I already replaced most - if not all - of the vacuum lines!).

Felipe

Title: Re: heat from defrost area
Post by: chardrc on August 14, 2009, 09:45:37 PM

both hvac vac lines come with check valves form the factory.. at least my 1990 did... but would be a good thing to check.